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19 Sep 2005, 20:22

Never mind, I see where I went wrong.

I assumed that the two 90-degree angles had to be opposites, because if they were adjacent I falsely assumed the quadrilateral would have to be a rectangle, because it would form two parallel lines. Of course, I realize now that these two parallel lines could be of different lengths, so the pair of angles where one is double the other could not involve a 90 degree angle at all.

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20 Sep 2005, 03:41

Hallo everybody, i think that both together are sufficient to answer the question if one of the interior angles is equal to 60 degrees.
From A) we know that 2 of the angles are right. We can select these in 6 ways
From B) we know that two adjacent angles ABC and BCD are in ratio- ABC/BCD= 2/1
Now by A) and B) by any comb of 2 angles that are right we can find info about the other angles and establish if there is an angle that is 60 degrees